Sorry, I can't help you at all. I do not use the Sony software or buy books from the Sony store...but.. I don't understand why they would put 4 books in one file. .....
I will say large files are slow, these readers do not exactly have cutting edge processors on them, and eInk is very slow to refresh the screen. I do have large files, and they are slow, but I have never had the "re-boot" issue you have... Hope someone can help you soon.
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